Both schools remain open and have taken advice from the Health Protection Agency (HPA).

The Woodham Rise school has told the News and Mail that it has a “robust pandemic policy” in place and has been liasing with the HPA, who has said that risk of more cases is very small so the school can remain open.

Head teacher Sabine Fellows said: “We are adhering to our well-established policies, taking regular advice from the Health Protection Agency and keeping all members of the school community informed.

“In the meantime, the school remains open as normal and we continue to reinforce good hygiene practice at school, in keeping with the Department of Health’s catch it, bin it, kill it advice.”

The announcement takes the total number of swine flu cases in Surrey to 21 after parents of pupils at Blenheim High School in Longmead Road, Epsom received a letter on Thursday stating that the school had a mild case of the virus.